Areoplanes move between the clouds and above the clouds.
When aeroplanes move between the clouds, the aeroplane generally
penetrates the cloud atmosphere, thus forcing the cloud to divide
into two or more separate clouds. Depending on the speed and
altitude, the likely byproduct of the separation is
precipitation.
When the speed of the aeroplane is such that it reaches maximum
velocity, friction will be generated between surfaces of the cloud
and the outer shell of the areoplane resulting in what is commonly
known as "lightning".